Question:
A permanent magnet in the shape of a thin cylinder of length $50 \,cm$ has intensity of magnetisaton $10^6\, A\, m^{-1}$. The magnetisation current is
A permanent magnet in the shape of a thin cylinder of length $50 \,cm$ has intensity of magnetisaton $10^6\, A\, m^{-1}$. The magnetisation current is
Updated On: Jun 23, 2023
- $5 \times 10^5\, A$
- $6 \times 10^5\, A$
- $5 \times 10^4\, A$
- $6 \times 10^4\, A$
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The Correct Option is A
Solution and Explanation
Here, $l = 50\, cm = 0.5 \,m$, $M = 10^6\, A\, m^{-1}$
As $M = \frac{magnetisation \,current \left(I_{M}\right)}{l\left( length\right)}$
Then, $I_{M }= M \times l = 10^{6} \times 0.5 = 5 \times 10^{5} \,A$.
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Concepts Used:
Magnetism & Matter
Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.
Magnetite is the world’s first magnet. This is also called a natural magnet. Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.
Read More: Magnetism and Matter
Some of the properties of the magnetic field lines are:
- The lines and continuous and outside the magnet, the field lines originate from the North pole and terminate at the South pole
- They form closed loops traversing inside the magnet.
- But here the lines seem to originate from the South pole and terminate at the North pole to form closed loops.
- More number of close lines indicate a stronger magnetic field
- The lines do not intersect each other
- The tangent drawn at the field line gives the direction of the field at that point.